Welcome to the site. There are a few options for swaps in a 1G many of which can be found via a search. If you give me some idea on your goals and more importantly your budget, I can try to assist you.

The stock EW is quite a durable and somewhat peppy engine which can be modified to deliver 100+ whp with alterations to IHE, cam and some tweaking to timing. The easiest swap will be the d16 browntop found in the '86-87 integra.